Adjustable joiht locking device



R. A. WALKER.

ADJUSTABLE lOINI LOCKING DEVICE.

APPLICATION FILED IAN. l6. l9l8.

awuemtoz Patented Nov. 25, 1919.

fiabert E. Walker;

attoznu,

ROBERT A. WALKER, 0F DES MOINES, IOWA.

ADJUSTABLE JOINT LOCKING DEVICE.

Specification of Letters Patent.

Application filed January 16, 1918. Serial No. 212,136.

To all whom it may concern:

Be it known that 1, ROBERT A. amina, a

citizen of the United States, residing at 1339' An iniiportant object ofthe invention is to provide a device of the above mentioned character,which is of simple construction, cheap to manufacture, and capable of alarge range of adjustment.

In the accompanying drawings fe 'niing a part of this specification andin which like numerals are employed to designate like parts t iroughoutthe same,

K Figure 1 is a side elevation of a device enibcdying my invention,

Fig. is a longitudinal section taken on line 2-2 of Fig. 1, and,

h 1 3 is a transverse section taken on line of Fig. 1.

in the drawings, the numeral 1 designates conduit or stack section,which is double walled, and adapted to telescope within an upper stackor ronduit section 2, which is also double walled.

' The lower inner conduit section 1 is provided upon its outer walls,upon the opposite sides thereof, with longitudinal grooves 3, adaptedfor the reception of locking strips l. preferably formed of sheet metal.The side walls are provided between their ends with tongl'les 5, whichproject across the grooves 8, and serve to prevent the outward orlateral displacement of the locking strips. At its ends. ach lockingstrip is bent inwardly, as shown at 6, to prevent longitudinaldisplacement thereof.

Each locking strip is provided with a plurality of V-shaped slits 7,forming a longitudinal row of tongues 8. and these tongues arevertically spaced, as shown.

In the use of the device, with the locking' strips at in place withinthe grooves 3, the upper-conduit section 2 may be moved longitudinallyof the lower conduit section 1, to the desired vertical position, andsupported in this position by bending up a selected pair of tongues 8,so that they engage the lower end of the conduit section.

It is to be understoodthat the form of my invention herewith shown anddescribed is to be tal'en as a preferred example of-the same, ant thatvariouschanges in the shape, size, and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the sub joined claims.

Having thus described my invention, 1 claim:

1. The combination with inner and outer conduit sections adapted totelescope, the inner conduit section being provided upon its outer sidewith a longitudinal recess and a pair of retaining tongues projectingpartly across the recess and spaced from each other, and a locking striparranged within he longitudinal recess and held in place by theretaining tongues and having its ends bent over the ends of the innerconduit section, said locking strip having a plurality of verticallyspaced tongues stamped therefrom, a selected vertically spaced tonguebeing adapted to be bent about the lower end of the outer conduitsection.

2. The combination with inner and outer conduit sections adapted totelescope, the inner conduit section being provided upon its oppositesides with longitudinal grooves and spaced retaining tongues extendingpartly across the groove, said tongues being arranged at a point nearthecentral portion of the grooves, sheet metal strips arranged withinthe grooves and disposed inwardly of said tongues and having their endsbent about the ends of the inner conduit section, said I sheet metalstrips having holding tongues stamped therefrom, said holding tonguesbeing vertically spaced and adapted to be bent outwardly to engagebeneath the lower ends ofthe outer conduit section.

In testimony that I claim the foregoing as my invention I have affixedmy signature in the presence of two witnesses on this 11th day ofJanuary, A. D. 1918.

ROBERT A. WALKER. Witnesses: G. C. WILLIAMS,

DONALD EVANS.

Patented Nov. 25, 1919. p

